+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   160657 (1999 XC142) Classification: Inner Main-belt Asteroid          SPK-ID: 2160657 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09521615299477536 4.5441e-08   a 1.982082975110834 1.113e-08 au q 1.793356659304342 8.762e-08 au i 24.04381058231581 5.3215e-06 deg node 67.38057667464984 1.1941e-05 deg peri 283.2946397236341 4.7763e-05 deg M 196.3791492824922 5.4945e-05 deg tp 2459463.752017409544 (2021-Sep-06.25201741) 0.0001582 TDB period 1019.251064495235 2.79 8.5848e-06 2.35e-08 d yr n .3532005141228703 2.9749e-09 deg/d Q 2.170809290917327 1.2189e-08 au   Orbit Determination Parameters    # obs. used (total)      561      data-arc span      8037 days (22.00 yr)      first obs. used      1998-04-28      last obs. used      2020-04-29      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50305      source      ORB      producer      Otto Matic      solution date      2020-May-21 01:34:31   Additional Information  Earth MOID = .895173 au   Jupiter MOID = 3.12579 au   T_jup = 3.747  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.4   n/a MPO341522   160657 (1999 XC142)          Discovered 1999-Dec-12 by LINEAR at Socorro Reference: 20070828/Numbers.arc Last Updated: 2007-08-30 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Jul-08 15:29 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin